1. Chapter 7.3 molar mass of a compound –
equal to the sum of the atomic masses of all atoms represented in its formula
also called formula mass
represents the number of grams in 1 mole of a compound
ex. H2O

2. Chapter 7.3
KClO3 Ba(NO3)2

3. Chapter 7.3

4. Chapter 7.3
we can also convert between molar mass and moles Find the number of moles in 6.60g of (NH4)2SO4 Find the moles in 4,500 g of Ca(OH)2

5. Chapter 7.3
Convert 25.0 moles of H2SO4 to grams

6. Chapter 7.3

7. Chapter 7.3
percent composition – expresses the percentage by mass of each element in a compound 𝑚𝑎𝑠𝑠 𝑜𝑓 𝑎𝑛 𝑒𝑙𝑒𝑚𝑒𝑛𝑡 𝑚𝑎𝑠𝑠 𝑜𝑓 𝑡ℎ𝑒 𝑐𝑜𝑚𝑝𝑜𝑢𝑛𝑑 ×100=% 𝑐𝑜𝑚𝑝𝑜𝑠𝑖𝑡𝑖𝑜𝑛 Find the percent composition of each element in H2O.

8. Chapter 7.3
Find the percent composition of each element in Ba(NO3)2

9. Chapter 7.3